Symfony 单独执行每个方法的示例也有其优点。您可以编写此返回$qb=$repository->createQueryBuilder'u'->select$qb->expr->count'u.id'->getQuery->getSingleScalarResult；是

---

单独执行每个方法的示例也有其优点。您可以编写此返回$qb=$repository->createQueryBuilder'u'->select$qb->expr->count'u.id'->getQuery->getSingleScalarResult；是的，它看起来是一个很好的解决方案，适用于更简单的情况。您可以通过筛选计数的标准，但我没有设法使它适用于按关联筛选关联的标准。请参阅此处的相关帖子：

$repository = $em->getRepository('FooBundle:Foo');

$qb = $repository->createQueryBuilder('n')
        ->where('n.bar = :bar')
        ->setParameter('bar', $bar);

$query = $qb->getQuery();

//this doesn't work
$totalrows = $query->getResult()->count();

$paginator = new \Doctrine\ORM\Tools\Pagination\Paginator($query);
$totalRows = count($paginator);

return $repository->createQueryBuilder('u')
            ->select('count(u.id)')
            ->getQuery()
            ->getSingleScalarResult();

 $qb = $em->createQueryBuilder()
     ->select('m.id', 'rm.id')
     ->from('Model', 'm')
     ->join('m.relatedModels', 'rm')
     ->groupBy('m.id');

class CountHydrator extends AbstractHydrator
{
    const NAME = 'count_hydrator';
    const FIELD = 'count';

    /**
     * {@inheritDoc}
     */
    protected function hydrateAllData()
    {
        return (int)$this->_stmt->fetchColumn(0);
    }
}
class CountSqlWalker extends SqlWalker
{
    /**
     * {@inheritDoc}
     */
    public function walkSelectStatement(AST\SelectStatement $AST)
    {
        return sprintf("SELECT COUNT(*) AS %s FROM (%s) AS t", CountHydrator::FIELD, parent::walkSelectStatement($AST));
    }
}

$doctrineConfig->addCustomHydrationMode(CountHydrator::NAME, CountHydrator::class);
// $qb from example above
$countQuery = clone $qb->getQuery();
// Doctrine bug ? Doesn't make a deep copy... (as of "doctrine/orm": "2.4.6")
$countQuery->setParameters($this->getQuery()->getParameters());
// set custom 'hint' stuff
$countQuery->setHint(Query::HINT_CUSTOM_OUTPUT_WALKER, CountSqlWalker::class);

$count = $countQuery->getResult(CountHydrator::NAME);

$qb = new QueryBuilder($conn);
$count = $qb->select("count(id)")->from($tableName)->execute()->fetchColumn(0);

   //in repository class:
   $count = $qb->select('count(p.id)')
      ->from('Products', 'p')
      ->getQuery()
      ->getSingleScalarResult();

    return $count;

    //in controller class:
    $count = $this->em->getRepository('RepositoryBundle')->...

    return $count-$offset;

/**
 * @return array
 */
public function getCourseCount()
{
    $qb = $this->getEntityManager()->createQueryBuilder();

    $qb
        ->select('count(course.id)')
        ->from('CRMPicco\Component\Course\Model\Course', 'course')
    ;

    $query = $qb->getQuery();

    return $query->getSingleScalarResult();
}

$query = $this->dm->createQueryBuilder('AppBundle:Items')
                    ->field('isDeleted')->equals(false)
                    ->getQuery()->count();